Abstract
This paper analyzes performance of optimal channel estimation and multiuser detection (MUD) in a block-fading code-division multiple-access (CDMA) channel on the assumptions of random spreading and large-system limit, by using the replica method developed in statistical mechanics. The authors find that the asymptotic spectral efficiency of the linear minimum mean-squared error (LMMSE) MUD which was proposed and analyzed by Evans and Tse in 2000 is indistinguishable from that of the optimal MUD for small system loads. Our results imply that performance of MUD scarcely improves even if one spends more computational cost than that of the LMMSE MUD, i. e., at most the cube of the number of users, on the above-described conditions.
| Original language | English |
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| Pages (from-to) | 22-34 |
| Journal | Journal of Systems Science and Complexity |
| Volume | 23 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 1 Feb 2010 |
| MoE publication type | A1 Journal article-refereed |
Funding
Department of Information and Communication Engineering, University of Electro-Communications, Tokyo 182-8585, Japan. Email: [email protected]. Mikko VEHKAPERÄ Department of Electronics and Telecommunications, Norwegian University of Science and Technology, Trondheim 7491, Norway. Email: [email protected]. Toshiyuki TANAKA Department of Systems Science, Graduate School of Informatics, Kyoto University, Kyoto 606-8501, Japan. Email: [email protected]. Ralf R. MÜLLER Department of Electronics and Telecommunications, Norwegian University of Science and Technology, Trondheim 7491, Norway. Email: [email protected]. ∗Tanaka acknowledges support through Grant-in-Aid for Scientific Research on Priority Areas (No. 18079010) from MEXT, Japan.
Keywords
- Channel estimation
- Code-division multiple-access (CDMA) systems
- Multiuser detection
- Replica method
- Spectral efficiency